Gas-engine.



A. BURBTT.

Patented June 7, 1910.

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A. BIRNETT.

GAS ENGINE.

APPLIOATION FILED PERB, 1908.

Patented June 7', 1910.

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ARCHIBALD BURNE'IT, 0F PHOENIX, BRITISH COLUMBA, CANADA.

GAS-ENGINE Specicaton of Letters '.Patent.

Patented June 7., 1916.

Application filed February vt3, 1908.- Sera-l No. 414,992.

To all whom it may concern:

BURNETT, town of Phoenix, in the Province of British Columbia, Canada, engineer, have invented certain new and useful Improvements in Gras-Engines, of which the following is the speciiication.

My invention relates t0 improvements in gas engines, and the object` of the invention is to provide a gas engine of the double actin g type which will be s elfstarting under all conditions and it consists `vessentially of a double acting engine provided with the usual piston and piston rod and crank shaft;

admission valves of vpeculiar construction 'and designed to admit gas and'air under pressure into the cylinder of the engine and at the beginning of the working 'stroke of the piston; mechanism for opening one of the admission valves to supply the initial charge to the cylinder, mechanism whereby such mixture of gas and air is automatically supplied at the commencement of each power stroke during the ruiming of the engine and mechanism whereby. the feeding of the gas to one end ofthe cylinder at one time only is assured as hereinafter more particularly described the following specification.

Figure 1 is a general perspective vieav of 'mv engine. Fig. 2 is an enlarged perspec- 4 tive detail of my admission valve gear and away and so to hold respectively compressed gas an l. admit a mixture of lline csa-b (see Fig. 3)..

4"with a double acting piston o the admission valye shown partially broken in' 'section to exhibitthe internal construction thereof. Fig. 3 is `a longitudinal section througlnjtlie `valve gear; Figl is a cross section through the valve gear on Fig. 5 is a similar view to Fig. 4 taken ,on line (2L-.d (see Fig. 3). Fig. 6 is an edgeivise elevation of the wrist plate. Fig. 7 is a similar view to Fig. l showing the coaoting roller imposition.

:in the drawings like characters of refer ence indicate corresponding' parts in' .each iigure. A.

f any desired 'in the usual to ed air. C .are the admission valvesdesigned to compressed airand 'gas The admission vaiveeon- 2)' a cylindrical forni and Iconnected the main shaft B.

B and B2 are compressor tanisidesi to .the cylinder,. sists of `(see Fig.

having a closed upper end `and an open is the cylinder of the engine provided Casing Cf.,

flanged lower end communicating with the admission port. l

G2 and C are annular enlargements forniing .annular channels and located intermediately of the length of the casing C, and C4 is' anv inner cylinder provided with an ailnular row of openings C5 Aand Cs located opposite the enlargements C2 and C3.

CS is the valve stem provided with the lower tapered yalve 'C9 resting upon the valve seat C10 formed at tlie lower end of the cylindrical casing C.

C is a balance valve designed to equalize .the force of gas and air in opposite directioiis as it enters the valve, thereby )reventing any liability of the valve f being forced od its seat.

. 12 and C are ring valves having radial cured to the valve stem intermediately of its length and are located normally .opposite the ports C5 and C and are designed to close the same.

2 and .3 are spectively from tanks to the annular .channels C2 the admission valve.

I will now describe ythe mechanism by which the admission is operated.

D ,is a stud extending through bearing boss ,3 secured V.on a suitable portion of .the engine. D ,isa bell vcrank suitably journaled. thereon. D2 is a segmental rock .arm also journaled'on the stud D and connected to the bell .crank D. The periphery of the segmental portion of the arm is provided with a circumferential groove C1". To .each sidepf the valve stem are formed bosses C14 from which depend flexible metallic strips ,Own The strips C15 are secured at Vtheir lower portion t0 the periphery of .the segmental arno and to eacli side of vthe cir- .eumterential groove G18.

Ds is a pin preferably rectangular in form lsecured in the u per .end of the'upivardly .extending arm o the bell crank.

D* is a ring j oiirnaled .on the lower step of the bearings-and provided with depending arm D5 and an upwardly inclined arm De.

and C3 of ,a pin DS extending from the upper .end `of .the 'arm DG; The crab .clanfeonsists of a '.nibstantia-lly horizont/:1l arm B9 .terminating ,ina ratchet .notcli'D1D and; nf'aninclined trip arm D11.

arms and a central hub. These valves are se-.

gas and air pipes leading re; the gas and air compressoril the. stepped' D7 is a crab claw 'pivotally supportedon i'io on a suitable pin. To each side of the fulcrum E are connected links T2.

' E2 are connected at their opposite endto the'depending arms D5 of the admission valve gears located at each end of the cylinder. j Y

By throwing the lever E in the direction indicated by arrow, the end of the.- crab claw arm D9 is caused to inount over the pin D3 until the pin -Da engages with the notch D10 in the position shown in the draw!` The lever E isthen thrown in the opposite direction'to that indicated by arrow thereby rocking the ri g D4 in the direction indicated by arrow (see Fig. et) and thereby carrying the crab claw D7, the pin D1s engaging the crab claw and the segmental arm 2, in the same-direction and opening the admission valve. .The gas and 'air under pressure flow from the tanks B and B2 through the pipes 2 and`3, the ports G5, C and the open valve C. By throwing the lever E farther in the same direction, the trip arm D11 engages the cam projection F thereby tripping the arm-l)9 from engagementwith the pin D3 and allowing the 'valve to close. f

lt will be observed that by the above opering.

ation the admission valve at both ends of the.

cylinder would be operated simultaneously and would therefore introduce a charge of gas into both ends ofthe cylinder simultaneously and allow one charge to neutralize -theother. To obviate this I have provided the following. mechanism. F is a float ring encircling the ring D1 but 'of narrower width. The ring- F is provided with the before mentioned cam F and a depending arm F2' (see Fig. 4). mounted on the stud G. The wrist plate G has a rocking motion imparted to it by means of the ec'centrics G2 mounted on tlie main shaft of the engine 'and connected to the wrist plate by the reversing l-inlf; mechanism G3, the lever G and connecting rod G5. GG are cams located to each side of the lwrist plate and on the periphery thereof.

The cam GG is provided with an extension G7. ends G10 and G11 for a purpose which will hereinafter appear (see F 1g. 6).' H are arms pivoted on studs H at their lower ends and provided with a. rectangular frame intermediately of their length. Secured in the sides of the frames are the arbors H2. @n vthe arbors H2 are loosely journaled the rollers H3, designed to bear on the periphery of the wrist plate and capable of lmigitiiclinal movement on the arbors H2. H4 are lever rods fulcrumed at their upper ends to a suitable portion of the frame oftheengine and connected intermediately of their length to the depending arms F2 of the float rings F bythe link bars H5. The lower ends of The links which the and lever rods H, H5 and H4.

G is a wrist plate G8 and G9 are walls having inturnedthe lever rods H4 are connected by the link bars HG to the upper ends of the arms'H.

As the wrist pin isvrockd to and fro byA means ofijts, connection to the eccentrics G2, the roller H3 travels on a path indicated by dotted lines in Fig.; 6. lt first travels in a direct line over the extension GT of the cam G6 untill it strikes the inturned portion of the wall G11. Thetroller H3 then travels `inwardly o n its snppoting arbor and on rthe `ret-urn movement of thel wrist pla-te the rollenreturns along the path marked' byY the inner dotted line until it strikes the inturned end G10 of the wall G9 which brings Athe roller again to its primary position. When the engine piston is at the end of its strokeassuming the end'5 ist-he end of the cylinderat iston is when starting, then the roller H3'w1ll have mounted onto the portion G7 of the cam Gf. The roller H3 beingl mounted on tlie cam GG the arm H is thrown outwardly and the iioat ring turned on .its bearing by means of the connecting link By this movement of the float ring c'amF is carried from beneaththe trip arm D11 of the crab claw D7 orinto the position shown in the drawingin Figli. The float-ring remains inA this position while the roller travels from the point 6 in its path to the point 7 and dur-l ing its return movement `to the point 8 (see 'I .F 6), or while the crank travels 90 from dead center, the roller travels from point 6 topoint- 7 and while the crank travels from to about 1200, theroller-travels from point 7 to point 8 from dead center.; Any time during this movement of theroller from point G to 8,kthe admission valve mayf be opened by operating the lever E- conneeted to the ring D4 by therods E2 which ring supports the crab claw'vDT. The

notch D10 of the crab claw engages the pin D3 supported on the. arms D; and thereby.' rocks the-arm D2 to depress the valve stem- CS. By continuing the movement of t-he lever E, the trip arm D11 engages the cam F- thereby disengaging the pin D3 from the notch D1.0 of the crab claw. The val-ve is. then closed by any suitable means'sueh as a weight (not shown) which may be attached to the arm D2, the weight being held in a. suitable dash pot. Upon'the crank of the engine cylinder passing the point of 120 `from dead center, the roller travels of the'v cam Gn at the point 8, therebyPtlrough itsconneetion to the iioat ringl Fl tile cam is carried beneath the trip arm D11,'thereby raising the arm Dn out of the path of ,the `pin DE and thereby disconnecting the lever E and the admission valve during the travel of the roller from point S back to point G and therefore during the revolution of vthe crank from 1200 from dead center back to dead center through the'reniaining 2400 of' its revolution, or while the piston is at the izo eeoaiee opposite end ot the cylinder and till its re- .turn to its primary position. Upon the piston reaching the opposite end ot vthe cylinder the roller H3 engages :with the cain- GG to allow opening the admission at the corresponding end. It will therefore be seen that a charge of gas or air can be admitted only at one end of the cylinder 'at a time and at the beginning of the working stroke.

The starting charge having been admitted and exploded by' any suitable mechanism l will now describe themeans which an admission valve is operated under the ordil'nary running conditions of the engine.

.l is a ring siipportediipon the upper step of the bearing 3, and J is an upwardly inclined arm extending therefrom, and J2 is a downwa 1dly inclined arm. The arm ,l2 is connected b v ay suitable link J3, lever J" and link to the wrist plate G1.

. JT is a crab claw similar to the c r'ab claw D7 and designed toA also engage with thev pin D3 in a similarmanner.

J is a cam formed on the sleeve Dto the inside ot the float ring.

The rockingmotion of the wrist plate is conveyed to the ring J by means of the link J3, lever J4 and link J5.

The trip 4arm lg engages with the cani. J and, as the arm J2 is operated by the wrist plate to rock the arm JS the crab claw .ll cngages the pin D3 to open the valve as the piston reaches the opposite,` end of the cylinder to the end from which the piston was started. The valves' at each end of 'the cylinderare operated in a similar manner before each working stroke of the piston.

By regulating the position of the cam'd6 in relation to the trip arinof the crab claw J7 by means of thele'ver E to which it is connected, the point of cnt oil of the admission valve may be reenlated so that a light 'change may be admitted for a light load.

, Although only show one c vlinde and the valve gears thereof it will be understood` ithat l. use a multiple cylinder engine so as to overcome the dead centers in starting and running the engine. I

The exhaust valvesmay able type operated i'rom the wrist plate of the engine.

What l claim as my invention is:

1, A engine comprising af cylinder and piston, a supply of gas and air .under pressure connected with said cylinder, valves on the engine, a hand lever for operating the be of any snit inder, a hand leverfor opening the valves to start the engine,-means permitting the hand lever to -open but one valve at a time, and means controlled by the engine for automatically controlling the valvesafter'the engine has been started.

3. n-e-nginei coinprisinga cylinder, a piston therein, an inlet valve at each end of the cylinder, a stem for each valve, abell crank lever, each lever being 'mounted on a stationary bearing, a segmental arm connected with said bell crank and engaging` the valve stein,

a. pin carried by one arm of the bell crank y lever, a ring jonrnalcd on the stationary bearing, a depending arm secured thereto, an upwardly inclined aiin on said ring, a crab claw lpivotally supported on said upwardly inclined arm and'consisting of a horizontal arm having a notch. therein adapted tozengage with the pin, and .a trip arm, a haiid lever connected to the depending arm, ay float ring having a ca-in thereon adapted to engage with thetrip arm to throw the notch out-of-engagement with the pin, and means operated by4 the engine'for oscillating said float ringto bring the cam` into engagement with the trip arm whereby one valveis keptclosed while the other is open.

l. An engine comprising a cylinder` a piston therein, an inlet valve at each end of 'the cylinder, a stem for each valve, a bell crank lever, each lever being mounted on a stationary bearing7 a segmental arm con- Anected with said bell crank and engaging the vz' lve stem, a pin carried by one arm of the bell crank lever, a ring vjoui-nailed on the stationary' bearing, a depending arm secured thereto, an upwardly inclined arm on said ring, a'orab claw pivotally supported on said,

upwardly inclined arm and consisting oa horizontall arm having a notch` therein adapted to engage with the, pin, andfa trip arm', a handlever connected .to the depending arm, a iioat ring having a cam thereon. adapted to enga-ge with the trip arm to throw the notch out of engagement with the, pin, and means operated' bythe engine for oscilla-ting said float 'ring` tobring lthe, cam in to engagement with the trip arm whereby one valve is kept closed while the other'is open, said .means consisting'of a wrist plate mounted on the cylinder, means for rocking the wrist plate from the engine, cams on the wrist plate, an arm pivoted at one'end to the cylinder, a roller carried by said varm engaging with the cam whereby the arm is given an oscillatoryniovement, and links connecting said arm withthe .floating ring. 5. An engine 'comprising a cylinder, a

piston therein, an inlet valve' at each end4 of' the piston, a stein for each valve, a bell crank lever, a Stationary bearing on which the bell the hell crank lever, a ring mounted torotate on the stationary bearing, an upwardly eX- tending arm on the ring, a crabclaw pivoted on said arm, said (flaw 4consist-ing ofpan arm having a notch therein adapted to engage with the pin, and a depending arm, a Wrist plate mounted on the cylinder, means for rookintlie same from the engine, linlrs connecting said Wrist plate with the rotating ring .to operate the lValve, a cam adapted to engage with the trip arm to release the notch from the pin, and means for adjusting the Aposition ot said earn.

6. "In a gas engine, a cylinder and piston, valves, means for controlling the valves, comprising awrist plate having peripheral camsthereon, substantially L-shape'in form,.

walls extending on each side of the plate trom the lbottom of the Cam and having their diagonal .opposite ends curved' inwardly,

arms pivoted at one end, connections from y the other end to the valves, arbors in said arms, rollers journaled loosely on said ar hors and capable of longitudinal movement for oscillating the arms'. f

-7. An engine comprising a cylinder, a piston` therein, inlet' valves, a stationary bearing looatednear'eacli Valye/ afbell crank on saidbearing, an arni connecting the bell crank with the valve,"a ,ring ni'oifinted on the bearing, a. ,cam on s'id ring, -an upwardly extending arm on said-ring, a eral) claw pivotedv on said arm and comprising, an arm having a notoh therein, and a trip armz a pin on the bell crank adapted to engage with thenoteh, a float ring on the bearing, a cam thereon adapted to engageV With' the trip arm to disengage the notch .from the pinion, a Wrist plate, means for rocking said Wrist plateron'i' the engine, means for Connecting lsaid Vplate With the floating ring to' oscillate the4 ring, a hand lever for rocking the first mentioned ring with the cam thereon, a third ring, an upwardly extending armthereon, aicrabelaw pivoted on said arm and eonsisting'of. anarm having a notch therein adapted to engage with the pin on the bell crank, and a triparm With which the cam von the first mentioned ring is vadapted to engage, and means for connecting said ring with the Wrist plate.

ARQ HIBALDl SBNETT. Witnesses JAMES W inn. 

